Merge pull request #344 from quodlibetor/extract-num-days-from-epoch
Add Datelike::num_days_from_epoch
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commit
9e50bfe034
18
src/lib.rs
18
src/lib.rs
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@ -454,6 +454,8 @@ macro_rules! try_opt {
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($e:expr) => (match $e { Some(v) => v, None => return None })
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}
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const EPOCH_NUM_DAYS_FROM_CE: i32 = 719_163;
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mod div;
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#[cfg(not(feature="clock"))]
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mod oldtime;
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@ -895,6 +897,7 @@ pub trait Datelike: Sized {
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///
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/// ~~~
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/// use chrono::{NaiveDate, Datelike};
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///
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/// assert_eq!(NaiveDate::from_ymd(1970, 1, 1).num_days_from_ce(), 719163);
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/// assert_eq!(NaiveDate::from_ymd(0, 1, 1).num_days_from_ce(), -365);
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/// ~~~
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@ -911,6 +914,21 @@ pub trait Datelike: Sized {
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ndays += ((year * 1461) >> 2) - div_100 + (div_100 >> 2);
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ndays + self.ordinal() as i32
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}
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/// Return the number of days since the unix epoch, 1970-01-01
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///
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/// # Example:
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///
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/// ```
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/// use chrono::{NaiveDate, Datelike};
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///
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/// assert_eq!(NaiveDate::from_ymd(1970, 1, 1).num_days_from_epoch(), 0);
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/// assert_eq!(NaiveDate::from_ymd(1969, 1, 1).num_days_from_epoch(), -365);
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/// assert_eq!(NaiveDate::from_ymd(1999, 12, 31).num_days_from_epoch(), 10_956);
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/// ```
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fn num_days_from_epoch(&self) -> i32 {
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self.num_days_from_ce() - EPOCH_NUM_DAYS_FROM_CE
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}
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}
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/// The common set of methods for time component.
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